SEGA and Nintendo Partnership

The last Nintendo Direct revealed that SEGA is partnering up with Nintendo to bring the next 3 Sonic games exclusively to the Nintendo Wii U and 3DS. What does this mean? Hopefully it means Nintendo will help SEGA with the Sonic franchise revive. Also if this partnership is successful, could Sega possibly become a second party developer for Nintendo? Does this mean Sonic will definitely make it into Super Smash Bros. 4?

The Regginator had this to say,

Originally Posted by http://www.comingsoon.net/news/gamenews.php?id=104440

The onetime rivalry between Mario and Sonic has grown into a friendship that has never been closer